Plate welding-type anchor channel and method for manufacturing same

ABSTRACT

There are provided a plate welding-type anchor channel that is buried when concrete is poured at the time of constructing a building to fix various external installations to a concrete structure later, and a method for the same. The anchor channel includes a stem plate ( 40 ) and an anchor head plate ( 50 ) that are coupled to be fixed, and can further improved anchorage performance as compared to the related art and to easily produce products of various standards. As a configuration of the plate welding-type anchor channel, a lower end ( 42 ) of the stem plate ( 40 ) of an anchor ( 30 ) is coupled to a top surface ( 24 ) of a channel ( 20 ) through welding to have a length (L 1 ) in a direction perpendicular to the top surface ( 24 ) of the channel ( 20 ). Further, the anchor head plate ( 50 ) has a predetermined length (L 2 ) and width (w 2 ), and an upper end ( 44 ) of the stem plate ( 40 ) is coupled to a bottom surface ( 52 ) through welding to be perpendicular to a length (L 1 ) direction of the stem plate ( 40 ).

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a National Phase of PCT Patent Application No. PCT/KR2011/009816 having International filing date of Dec. 20, 2011, which claims the benefit of priority of Korean Patent Application No. 10-2011-0137060 filed on Dec. 19, 2011. The contents of the above applications are all incorporated by reference as if fully set forth herein in their entirety.

TECHNICAL FIELD

The present invention relates to a plate welding-type anchor channel and a method for manufacturing the same, and more particularly, a plate welding-type anchor channel that is buried when concrete is poured at the time of constructing a building to fix various external installations to a concrete structure later, and a method for manufacturing the same.

BACKGROUND ART

An anchor channel or an anchor rail provide functions for fixing or easily separating various installations to or from a wall surface of a building, for example, fixation of a curtain wall of a building and various panels, fixation of a rail provided in a factory and a warehouse, fixation of a service wiring to a wall surface of a tunnel, and fixation of a chair in the gym, and, thus, application fields thereof have been expanded.

Such an anchor channel includes an anchor that is buried in concrete when the concrete is poured, and a channel in which a guide space into which an external fastener such as a T bolt is inserted is exposed to the outside of the concrete. At this time, the channel is supported by the anchor to be stably fixed to the concrete, and the fastener is coupled to the channel later to fix various installations to a concrete wall surface. In general, the channel having a standardized shape and size is provided to be coupled to the fastener inserted from the outside.

Meanwhile, unlike the channel having the standardized shape and size, in the anchor channel, various shapes of anchors are proposed. “Anchor rail” disclosed in Korean Patent Registration No. 10-0260341 proposes a technology in which an anchor rail for building construction includes one or more anchors protruding from an anchor rail, an anchor lower part that is coupled to the anchor rail in a shape fitting manner, and one attachment part that is positioned at a free end formed a shank of the anchor, and the shank of the anchor is at least manufactured as a tube having a predetermined length.

Further, “Integrated channel buried in concrete structure” disclosed in Korean Patent Registration No. “10-0712233” proposes a technology in which a channel includes a bolt that is fastened to a bracket supporting a supporting target; a body whose upper ends at both sides are inclined to protrude toward the inside in order to prevent the bolt from being separated; and a support that is integrally formed with a bottom surface of the body to prevent the body from being pulled out, and the channel is buried in building structures such as a slab and a wall.

Furthermore, “Anchor rail” disclosed in Korean Patent Publication No. 10-2010-0070297 suggests a technology in which an anchor rail includes a rail body, the rail body is provided with an accommodating space for accommodating a fastening component for fixing a fixation element to the anchor rail, the rail body is provided with a hole, and a coupling component for fixing an anchor element to the rail body is provided within the hole. In addition, the coupling component is formed as a rivet, a fixation section of the rivet inserted into the hole is expanded to fix the rivet to the rail body, and the rivet is provided with a fixing means for fixing the anchor element to the rail body.

Moreover, “Method for manufacturing improved buried-type channel for fixing fastener” disclosed in Korean Patent Registration No. 10-0995121 suggests a technology in which a channel includes a channel in which both sides at an opened top are rounded inward so as to prevent an inserted T bolt from being separated; and a plurality of anchors that is integrally joined to a bottom surface of the channel in a line, and the anchor includes a main body in which one end is integrally joined to a lower part of the channel to have a steel bar shape; and a disc-shaped support that is integrally formed at the other end of the main body.

FIG. 1 is a diagram for describing anchor channels according to the related art.

Referring to FIG. 1, in an anchor of an anchor channel according to the related art, anchor heads 1 and 3 are integrally formed at both ends of a stem 2 through rolling as shown in (a) of FIG. 1, holes for joining rivets are formed in a channel, and then the anchor heads coupled to the channel are joined through rivet-forging. Further, as shown in (b) of FIG. 1, anchor heads are integrally formed at both ends of a stem through rolling, and an end of one anchor head is welded to a channel along a rim. As shown in (c) of FIG. 1, an anchor head is integrally formed at one end of a stem through rolling, and the other end is welded to a channel through stud-welding. As shown in (d) of FIG. 1, an integrated anchor formed by cutting section shape steel produced through rolling is applied, and one end of the section shape steel is welded to a channel along a rim similarly to (b) of FIG. 1. As shown in (e) of FIG. 1, a steel material bent in a ruler shape is applied to an anchor head 1 and a stem 2, and a vertical end is welded to a channel. A steel material bent in a wavy shape is welded to a channel as shown in (f) of FIG. 1.

The configuration of the anchor channel is largely divided into the channel and the anchor. An existing standard product is typically used as the channel, and the anchor is divided into the anchor head and various types of anchor channels depending on geometrical features of the stem or coupling methods. The anchor has a great influence on anchorage performance of the anchor channel and producible standards and cost.

Accordingly, the anchor channel according to the related art needs to improve the anchorage performance with the concrete structure or needs to have a new improved shape in order to increase production efficiency. That is, the anchor head in the anchor channel according to the related art is integrally formed through rolling (for example, (a), (b), (c) and (d) of FIG. 1). Furthermore, when the anchor head is formed through rolling, since a rolled portion has a gentle curvature due to a characteristic of the rolling process, inclined portions are formed at portions adjacent to the anchor head and the stem as shown in (a), (b), (c) and (d) of FIG. 1, so that the anchorage performance of the anchor may be degraded. Particularly, a curvature (about 10 mm) may be caused in a portion where the anchor head and the stem come in contact with each other due to the characteristic of the rolling process. The curvature portion additionally causes bearing stress applied to the concrete from the anchor, and becomes a main factor that decreases the anchorage performance of the anchor channel. Particularly, when a stud-shaped anchor channel (for example, (a), (b) and (c) of FIG. 1) is used, a length of a circumference of the portion where the anchor head and the stem come in contact with each other is relatively short. Since local bearing stress applied to the concrete adjacent to the stem from the anchor head is further increased due to the short circumference length, the anchorage performance may be degraded.

In addition, since the rolling process (particularly, (d) of FIG. 1) needs to install a large scale rolling facility (a plurality of rolling processes), initial investment cost is increased, and a time and cost for replacing a rolling facility suitable for a standard are consumed. As a result, since the section shape steel having an appropriate standard required for the anchor channel is not supplied, it is difficult to achieve small quantity batch production.

Moreover, when the anchor head is inserted into the channel to assembly as shown in (a) of FIG. 1, since there is a gap in a joined portion of the anchor head and the channel, there is a growing concern about erosion due to rainwater moisture.

In addition, in (e) of FIG. 1, the anchor head has an asymmetry geometrical shape with respect to an axial direction of the stem. In such a case, it is found in various research papers and experiments that anchorage capability of the anchor head is low due to eccentric stress and excessive bearing stress occurring at the inside of a bending portion. In (f) of FIG. 1, the anchor channel is attached to the concrete without using the anchor head. Therefore, the anchor channels shown in (e) and (f) of FIG. 1 have the lowest anchorage performance among the existing anchor channels.

DISCLOSURE Technical Problem

In order to solve the problems of the related art, an object of the present invention is to provide a new plate welding-type anchor channel that is buried when concrete is poured at the time of constructing a building to fix various external installations to a concrete structure later with which it is possible to improve anchorage performance in terms of structure to exhibit stabilized performance in being coupled to a concrete structure and it is possible to conveniently manufacture anchor channels of various standards, and a method for manufacturing the same.

Technical Solution

In order to achieve the above object, an embodiment of the present invention provides a plate welding-type anchor channel that is buried when concrete is poured at the time of constructing a building to fix various external installations to a concrete structure later. The anchor channel includes a channel (20) that has a predetermined width (W) and includes a bottom surface (22) and a top surface (24), in which a guide space (21) is formed to be opened in the bottom surface (22) so as to allow an external fastener to be moved in a longitudinal direction, and that is buried in the concrete so as to allow the guide space (21) to be exposed to the outside of the concrete; and an anchor (30) that is coupled to the top surface (24) of the channel (20) and is buried in the concrete when the concrete is poured. The anchor (30) includes: a stem plate (40) in which a lower end (42) is coupled to the top surface (24) of the channel (20) through welding so as to have a length (L1) in a direction perpendicular to the top surface (24) of the channel (20); and an anchor head plate (50) that has a predetermined length (L2) and width (w2), and in which an upper end (44) of the stem plate (40) is coupled to a bottom surface (52) through welding so as to be perpendicular to a length (L1) direction of the stem plate (40).

In the plate welding-type anchor channel having the aforementioned feature, the anchor head plate (50) and the stem plate (40) of the anchor (30) may be made from plates, and have widths (w1 and w2) within the width (W) of the channel (20).

In the plate welding-type anchor channel having the aforementioned feature, a horizontal cross-sectional area (A2) of the anchor head plate (50) of the anchor (30) may be 10 times greater than a horizontal cross-sectional area (A1) of the stem plate (40).

In the plate welding-type anchor channel having the aforementioned feature, the stem plate (26) of the anchor (30) may be provided with holes (45).

In order to achieve the above object, another embodiment of the present invention provides a method for manufacturing a plate welding-type anchor channel that is buried when concrete is poured at the time of constructing a building to fix various external installations to a concrete structure later. The method includes: preparing a channel (20) that has a predetermined width (W) and includes a bottom surface (22) and a top surface (24), in which a guide space (21) is formed to be opened in the bottom surface (22) so as to allow an external fastener to be moved in a longitudinal direction, and that is buried in the concrete so as to allow the guide space (21) to be exposed to the outside of the concrete, and an anchor (30) that is coupled to the top surface (24) of the channel (20) and is buried in the concrete when the concrete is poured; and integrally coupling the channel and the anchor. The preparing the anchor (30) includes: preparing a first plate (40′) and a second plate (50′) that are made from plates having predetermined lengths (L1 and L2) and widths (w1 and w2); coupling an upper end (44) of the first plate (40′) to a bottom surface (54) of the second plate (50′) through welding to be perpendicular to a length (L1) direction of the first plate (40′); and coupling a lower end (42) of the first plate (40′) through welding to be perpendicular to the top surface (24) of the channel (20).

In the method for manufacturing a plate welding-type anchor channel, the preparing the anchor (30) may include forming a hole (45) in the first plate (40′).

Effect of the Invention

In accordance with a plate welding-type anchor channel and a method for manufacturing the same according to the present invention, since plate materials are welded to form an anchor head, it is possible to exhibit further geometrically improved anchorage performance as compared to the anchor channel according to the related art in which the anchor head is formed through rolling, and it is possible to easily produce products of various standards. As a result, it is possible to apply to small quantity batch production and to reduce cost of the product. Particularly, when the stem plate provided with the holes is applied to the anchor channel, since the local bearing stress applied to the concrete from the anchor head is further decreased, it is possible to further improve the anchorage performance of the anchor channel. Therefore, recent construction tends to further improve safety while connecting heavy-weight important installations to the concrete structure by the anchor channel using the plate welding method, it is possible to exhibit the most excellent effect in terms of the anchorage performance. Furthermore, in accordance with the plate welding-type anchor channel according to the present invention, it is possible to easily realize production of high production efficiency, excellent performance, and a stabilized welding quality by a very advanced welding controlling technology and a production automating technology.

DESCRIPTION OF DRAWINGS

FIG. 1 is a diagram for describing anchor channels according to the related art.

FIG. 2 is a diagram illustrating a plate welding-type anchor channel according to the present invention when viewed in a cross section direction and a longitudinal direction.

FIG. 3 is a diagram for comparing cross sections of a stem plate and an anchor head plate of an anchor in the plate welding-type anchor channel according to the present invention.

FIG. 4 is a diagram for comparing a structural feature of an anchor head of the plate welding-type anchor channel according to the present invention with that of an anchor head of the anchor channel according to the related art.

FIG. 5 is a diagram for comparing a structural feature of a channel connection portion of the plate welding-type anchor channel according to the present invention with that of the anchor channel according to the related art.

FIG. 6 is a diagram for describing a plate welding-type anchor channel according to a preferred embodiment of the present invention.

FIG. 7 is a diagram for describing a method for manufacturing the plate welding-type anchor channel according to the preferred embodiment of the present invention.

FIG. 8 is a diagram for comparing a cross-sectional area of a stem plate and a cross-sectional area of an anchor head plate provided with holes of the anchor in the plate welding-type anchor channel according to the preferred embodiment of the present invention.

BEST MODE

FIG. 1 is a diagram showing anchor channels according to the related art.

Referring to FIG. 1, features of configurations of the anchor channels according to the related art are as follows.

The anchor channel according to the related art shown in (a) of FIG. 1 includes an upper anchor head 1, a stem 2 having a circular cross section, a lower anchor head 3, and a channel 4. The upper anchor head 1, the stem 2 and the lower anchor head 3 are integrally formed through rolling, and the lower anchor head 3 penetrates through the channel 4 to be formed in a guide space 21.

The anchor head according to the related art shown in (b) of FIG. 1 includes an upper anchor head 1, a stem 2 having a circular cross section, a lower anchor head 3, and a channel 4. The upper anchor head 1, the stem 2 and the lower anchor head 3 are integrally through rolling, and the lower anchor head 3 is coupled to a top surface 24 of the channel 4 through welding along a circumference.

The anchor channel according to the related art shown in (c) of FIG. 1 includes an upper anchor head 1, a stem 2 having a circular cross section, and a channel 4. The upper anchor head 1 and the stem 2 are integrally formed through rolling, and the stem 2 is coupled to a top surface 24 of the channel 4 through welding along a shear surface.

The anchor channel according to the related art shown in (d) of FIG. 1 includes an upper anchor head 1, a stem 2 having a rectangular cross section, a lower anchor head 3, and a channel 4. The upper anchor head 1, the stem 2 and the lower anchor head 3 are integrally formed through rolling, and the lower anchor head 3 is coupled to a top surface 24 of the channel 4 through welding along a circumference.

The anchor channel according to the related art shown in (e) of FIG. 1 includes an asymmetry upper anchor head 1, a stem 2 having a rectangular cross section, and a channel 4. The upper anchor head 1 and the stem 2 are integrally formed to be bent, and the stem 2 is coupled to a top surface 24 of the channel 4.

The anchor channel according to the related art shown in (f) of FIG. 1 includes a stem 2 that is formed to be bent and has a rectangular cross section, and a channel 4, and the stem 2 is coupled to a top surface 24 of the channel 4.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to FIGS. 6 and 8. In FIGS. 2 to 6, components having the same function are assigned the same reference numerals. Meanwhile, detailed descriptions of technologies that are easily applied in general by those skilled in the art from related technologies in the art such as effects and execution methods of a channel and an anchor of an anchor channel in the respective drawings will not be presented. Further, in the drawings, a ratio of sizes of elements is differently illustrated or sizes of components that are coupled to each other are differently illustrated. However, in the drawings, since differences in sizes can be easily understood by those skilled in the art, separate descriptions will not be presented.

FIG. 6 is a diagram for describing a plate welding-type anchor channel according to a preferred embodiment of the present invention, FIG. 7 is a diagram for describing a method for manufacturing the plate welding-type anchor channel according to the preferred embodiment of the present invention, and FIG. 8 is a diagram for comparing a cross-sectional area A1 of a stem plate and a cross-sectional area A2 of an anchor head plate of an anchor in the plate welding-type anchor channel according to the preferred embodiment of the present invention.

Referring to FIGS. 2 and 6, a plate welding-type anchor channel 10 according to the preferred embodiment of the present invention includes a channel 20 and an anchor 30, and is buried when concrete is poured at the time of constructing a building to easily fix various external installations to a concrete structure later.

At this time, the channel 20 has a predetermined width W, and includes a bottom surface 22 and a top surface 24. A guide space 21 is formed to be opened in the bottom surface 22 so as to allow an external fastener to be moved in a longitudinal direction, and the channel is buried in the concrete to allow the guide space 21 to be exposed to the outside of the concrete. The channel 20 is formed to allow the external fastener such as a T bolt to be inserted into the guide space 21, and has a standardized shape and size so as to be coupled to the fastener inserted from the outside.

The anchor 30 is coupled to the top surface 24 of the channel 20, and is buried in the concrete at the time of pouring the concrete. In the present embodiment, the anchor 30 includes a stem plate 40 and an anchor head plate 50. Here, a lower end 42 of the stem plate 40 is coupled to the top surface 24 of the channel 20 through welding so as to have a length L1 in a direction perpendicular to the tope surface 24 of the channel 20. The anchor head plate 50 is formed to have a predetermined length L2 and width w2, and an upper end 44 of the stem plate 40 is coupled to a bottom surface 52 through welding so as to be perpendicular to a length (L1) direction of the stem plate 40.

Meanwhile, in the present invention, the anchor head plate 50 and the stem plate 40 of the anchor 30 are made from plates, and are formed to have widths w1 and w2 within the width W of the channel 20. That is, in the present embodiment, the anchor head plate 50 and the stem plate 40 of the anchor 30 are preferably manufactured using plates having widths slightly smaller the width W of the channel 20 and the same width, so that it is possible to improve convenience to manufacture.

Further, as described above, in the plate welding-type anchor channel 10 according to the present embodiment, in order to maximize anchorage performance, a horizontal cross-sectional area A2 of the anchor head plate 50 of the anchor 30 is 10 times greater than a horizontal cross-sectional area A1 of the stem plate 40.

In the related art in which the anchor channel 10 is formed through rolling, bearing strength is increased depending on an angle on an inner surface of the anchor head (particularly, a portion adjacent to the stem). However, in the plate welding-type anchor channel 10 according to the preferred embodiment of the present invention, since the stem plate 40 and the anchor head plate 50 are made from the plates and are coupled to each other to be perpendicular, the bearing strength is relatively less, so that it is possible to improve anchorage performance.

Further, in the plate welding-type anchor channel 10 according to the preferred embodiment of the present invention, a length of a circumference of a joined portion of the stem plate 40 and the anchor head plate 50 is maximized to reduce local bearing as compared to the related art. As you know, low local bearing means low slip, and the low slip increases an anchorage effect. Furthermore, as you know, the portion (the circumference length) adjacent to the stem is maximized to maximize a concrete conical failure area. Since the conical failure area of the plate welding-type anchor channel 10 according to the present embodiment is increased, even though an installation depth of the anchor 30 is shallower than that of an existing anchor, it is possible to secure the same area or larger. Even though a length L1 of the anchor 30 is shorter than that of the anchor channel according to the related art, it is possible to exhibit anchorage performance of the same level or higher.

Referring to FIG. 7, a method for manufacturing the plate welding-type anchor channel according to the preferred embodiment of the present invention is characterized in that the channel 20 and the anchor 30 that have the aforementioned configurations is integrally coupled through welding. At this time, the anchor 30 includes the stem plate 40 and the anchor head plate 50, and the stem plate 40 and the anchor head plate 50 may be coupled through welding by variously combining different material strengths or thicknesses depending on the purpose. Moreover, an order of coupling the stem plate 40 and the anchor head plate 50 may be selectively decided depending on convenience of a worker, when necessary. For example, depending on workers or work conditions, the stem plate 40 may be welded to the channel 20 and then the anchor head plate 50 may be welded to the welded stem plate and channel. The anchor head plate 50 and the stem plate 40 may be welded, and the welded anchor head plate and stem plate may be welded to the channel 20.

More specifically, in the method for manufacturing the plate welding-type anchor channel according to the preferred embodiment of the present invention, the channel 20, a first plate 40′ for the stem plate 40 and a second plate 50′ for the anchor head plate 50 are prepared, and are integrally coupled through welding.

In general, in the preferred embodiment of the present invention, the first plate 40′ and the second plate 50′ have different thicknesses and the same material strength, but may be easily applied to a case where the first plate and the second plate need to have the same thickness or different material strengths. In the anchor channel according to the related art, since the anchor is integrally made of a single material through rolling, one material strength is merely used. In addition, in the anchor channel according to the related art, the anchor is manufactured through rolling. That is, since standards of the anchor head and the stem have only several limited dimensions, it is difficult to produce anchor channels having various optimized dimensions required on site.

At this time, since the channel 20 having a standard size and shape is typically provided, the channel 20 is formed to be suitable for a general standard. Further, the first and second plates 40′ and 50′ for the stem plate 40 and the anchor head plate 50 of the anchor 30 are prepared using the width W of the channel 20 as a reference. That is, the first plate 40′ and the second plate 50′ are made from plates having predetermined lengths L1 and L2 and widths w1 and w2. Furthermore, the upper end 44 of the first plate 40′ is coupled to a bottom surface 54 of the second plate 50′ through welding to be perpendicular to the length (L1) direction of the first plate 40′, and the lower end 42 of the first plate 40′ is coupled through welding to be perpendicular to the top surface 24 of the channel 20.

Meanwhile, in the preferred embodiment of the present invention, in the step of preparing the anchor 30, holes 45 may be additionally formed in the first plate 40′. Under the condition where the cross-sectional area A1 and the thickness ‘t’ are the same, when the stem plate 40 of FIG. 8 has the cross-sectional area A1, a circumference length (L=2B) is longer than the circumference length in FIG. 3. Thus, when the holes 45 are formed in the stem plate 40 as shown in FIG. 8, the bearing stress is reduced, and the anchorage performance is improved. Further, since the bearing stress is decreased, failure possibility of a welded portion of the anchor is reduced to improve safety of the welded portion of the anchor channel.

As stated above, although the plate welding-type anchor channel according to the preferred embodiment of the present invention has been illustrated in conjunction with the aforementioned descriptions and drawings, these descriptions and drawings are merely presented as examples. It is to be appreciated that those skilled in the art can variously change or modify the embodiments without departing from the technical spirit of the present invention.

Mode for Invention

FIG. 2 is a diagram illustrating the plate welding-type anchor channel according to the present invention when viewed in a cross section direction and a longitudinal direction.

The plate welding-type anchor channel shown in FIG. 2 includes the anchor head plate (50) serving as the upper anchor head 1, the stem plate 40 serving as the stem 2, and the channel 20. The stem plate 40 and the anchor head plate 50 are separate members, and are coupled to each other through welding. The stem plate 40 is coupled to the top surface 24 of the channel 20 through welding.

Referring to FIG. 2, similarly to the general anchor channel, the plate welding-type anchor channel 10 according to the present invention includes the channel 20 and the anchor 30. The anchor channel is buried when the concrete is poured at the time of constructing the building to fix various external installations to the concrete structure later.

At this time, the channel 20 has the predetermined width W, and includes the bottom surface 22 and the top surface 24. The guide space 21 is formed to be opened in the bottom surface 22 so as to allow the external fastener to be moved in the longitudinal direction, and the channel is buried in the concrete so as to allow the guide space 21 to be exposed to the outside of the concrete. The channel 20 is formed so as to allow the external fastener such as a T bolt to be inserted in the guide space 21, and has a standardized shape and size to be coupled to the fastener inserted from the outside. Further, the anchor 30 is coupled to the top surface 24 of the channel 20, and is buried in the concrete when the concrete is poured.

Since the plate welding-type anchor channel 10 according to the present invention includes the stem plate 40, the anchor head plate 50 and the channel 20 that are coupled to be fixed through welding, it is possible to further improve the anchorage performance as compared to the anchor channel according to the related art, and it is possible to easily produce products of various standards.

At this time, the lower end 42 of the stem plate 40 of the anchor 30 is coupled to the top surface 24 of the channel 20 through welding so as to have the length L1 in the direction perpendicular to the top surface 24 of the channel 20. Moreover, the anchor head plate 50 is formed to have the predetermined length L2 and width w2, and the upper end 44 of the stem plate 40 is coupled to the bottom surface 52 through welding to be perpendicular to the length (L1) direction of the stem plate 40.

Unlike the related art in which the anchor channel is formed through rolling, the anchor head plate 50 and the stem plate 40 of the anchor 30 according to the present invention are obtained by cutting general plate materials that are variously provided and are welded to allow the channel 20, the stem plate 40 and the anchor head plate 50 to be fixed. Accordingly, it is possible to further improve the anchorage performance as compared to the anchor channel according to the related art, so that it is possible to improve stability of the installations and the concrete structure connected to the anchor channel. In addition, it is possible to easily produce products of various standards, and it is possible to provide various sizes and shapes of anchor channels when necessary without using a large scale facility for rolling. As a result, the various sizes and shapes of anchor channels can be easily applied to small quantity batch production.

FIG. 3 is a diagram for comparing cross sections of the stem plate and the anchor head plate of the anchor in the plate welding-type anchor channel according to the present invention.

As shown in FIG. 3, in the plate welding-type anchor channel 10 according to the present invention, the horizontal cross-sectional area A2 of the anchor head plate 50 is preferably 10 times greater than the horizontal cross-sectional area A1 of the stem plate 40.

More specifically, in order to describe the feature of the plate welding-type anchor channel 10 according to the present invention, a rectangular plate structure is exemplified. In the rectangular plate structure, the widths w1 and w2 of the stem plate 40 and the anchor head plate 50 are preferably the same. At this time, since the horizontal cross-sectional area A2 of the anchor head plate 50 is 10 times greater than the horizontal cross-sectional area A1 of the stem plate 40, it is possible to secure sufficient anchorage performance. In the present invention, limitations of the cross-sectional areas of the stem plate 40 and the anchor head plate 50 are applied based on a proportional relation between the most suitable cross-sectional areas for the anchor head and the stem which has been proposed by Abdel-Salam Mokhatar, Amin Ghali and Walter Diger et al., in “Stud Shear Reinforcement for Flat Concrete Plates,” ACI Journal (TECHNICAL PAPER), Title no. 82-60.

Based on a recent research result, it can be seen through experiments that as the bearing stress applied to the inner surface of the anchor head, particularly, the circumference of the stem coming in contact with the anchor head is low, the anchorage effect is excellent.

FIG. 4 is a diagram for comparing the upper anchor head 1 and the stem 2 of the plate welding-type anchor channel according to the present invention with those of the anchor channel according to the related art. (a) of FIG. 4 is a diagram for describing bearing stress for the anchor channel according to the related art in which the anchor includes the upper anchor head 1 and the stem 2 formed by bending the single plate material as shown in (e) of FIG. 1. (b) of FIG. 4 is a diagram for describing bearing stress for the anchor channel according to the related art in which the anchor includes the upper anchor head 1 formed through rolling as shown in (a), (b), (c) and (d) of FIG. 1. (c) of FIG. 4 is a diagram for describing bearing stress for the plate welding-type anchor channel according to the present invention, and (d) of FIG. 4 is a diagram for geometrically describing magnitude of bearing stress for the anchor channel according to the related art in which the anchor 30 includes the stud-shaped upper anchor head 1 formed through rolling as shown in (a), (b) and (c) of FIG. 1. (e) of FIG. 4 is a diagram for geometrically comparing magnitude of the bearing stress for the plate welding-type anchor channel according to the present invention with that in (d) of FIG. 4.

Referring to FIG. 4, the plate welding-type anchor channel 10 according to the present invention can provide further improved anchorage performance as compared to the anchor channel according to the related art shown in FIG. 1. Further, according to the research until now, it has been known that the anchorage performance is in inverse proportion to the magnitude of the bearing stress applied to the concrete from the anchor head.

As shown in (a), (b) and (c) of FIG. 4, even though the same tensile force P is applied to the stem depending on a geometrical shape of the anchor head, bearing stresses σ applied to the concrete are different from each other (σ₁>σ₂>σ₃).

(a) of FIG. 4 corresponds to (e) or (f) of FIG. 1 which is the related art, and (b) of FIG. 4 corresponds to (a), (b), (c) or (d) of FIG. 1 which is the related art. The plate welding-type anchor channel 10 according to the present invention corresponds to (c) of FIG. 4, and has a geometrical structure in which the bearing stress applied to the concrete is the smallest.

Furthermore, as shown in (d) and (e) of FIG. 4, a difference in bearing stress applied to the concrete can be mathematically described by Formula.

In (d) of FIG. 4, when an incline θ is, for example, 30 degrees, bearing force R is obtained as R=P/cos 30. A difference in bearing force of about 15% or more occurs from this value in comparison to bearing force R=P in (e) of FIG. 4.

As shown in (d) and (e) of FIG. 4, the magnitude of the bearing stress applied to the concrete is in inverse proportion to the circumference length of the stem. In (d) of FIG. 4, when D=1 cm, for example, the circumference length of the stem is obtained as L=π×1=3.14 cm. However, since the circumference length of L=2×B in (e) of FIG. 4 can increase a width B by adjusting a thickness t while maintaining the same cross-sectional area (A=π×1²/4) as that in (d) of FIG. 4, the circumference length (L=2×B) can be considerably greater than that in (d) of FIG. 4. Accordingly, it is possible to decrease the bearing force applied to the concrete.

Since the plate welding-type anchor channel according to the present invention corresponds to (e) of FIG. 4, it can be seen through the aforementioned description that the bearing stress σ is the smallest due to a geometrical feature in comparison to the anchor channel according to the related art shown in FIG. 1. Therefore, it is possible to achieve further improved anchorage performance as compared to the anchor channel according to the related art.

FIG. 5 is a diagram for comparing a structural feature of a channel connection portion of the plate welding-type anchor channel according to the present invention with that of the anchor channel according to the related art.

Referring to FIG. 5, since occurrence of slip of the anchor 30 coupled to the top surface 24 of the channel is considerably reduced as compared to the anchor channel according to the related art, the plate welding-type anchor channel 10 according to the present invention can provide further improved anchorage performance.

(a) of FIG. 5 is a diagram illustrating a case where the slip of the top surface 24 of the channel 4 is caused due to tensile force applied to the stem 2 as depicted by dotted lines. Such a case corresponds to (a), (b) or (c) of FIG. 1 that shows the anchor channel according to the related art.

(b) of FIG. 5 is a diagram illustrating a case where the slip of the anchor head 3 is caused due to the tensile force applied to the stem 2 as depicted by dotted lines. Such a case corresponds to (d) of FIG. 1 that shows the anchor channel according to the related art.

(c) of FIG. 5 illustrates a part of the plate welding-type anchor channel 10 according to the preferred embodiment of the present invention, and is a diagram for comparing the occurrence of the slip as depicted by dotted lines (c) of FIG. 5 with the occurrence of the sip as depicted by dotted lines (a) and (b) of FIG. 5 because the stem plate 40 and the channel 20 is directly coupled to each other through welding.

INDUSTRIAL APPLICABILITY

In accordance with a plate welding-type anchor channel and a method for manufacturing the same according to the present invention, since plate materials are welded to form an anchor head, it is possible to exhibit further geometrically improved anchorage performance as compared to the anchor channel according to the related art in which the anchor head is formed through rolling, and it is possible to easily produce products of various standards. As a result, it is possible to apply to small quantity batch production and to reduce cost of the product. Particularly, when the stem plate provided with the holes is applied to the anchor channel, since the local bearing stress applied to the concrete from the anchor head is further decreased, it is possible to further improve the anchorage performance of the anchor channel. Therefore, recent construction tends to further improve safety while connecting heavy-weight important installations to the concrete structure by the anchor channel using the plate welding method, it is possible to exhibit the most excellent effect in terms of the anchorage performance. Furthermore, in accordance with the plate welding-type anchor channel according to the present invention, it is possible to easily realize production of high production efficiency, excellent performance, and a stabilized welding quality by a very advanced welding controlling technology and a production automating technology. 

1. A plate welding-type anchor channel that is buried when concrete is poured at the time of constructing a building to fix various external installations to a concrete structure later, the anchor channel comprising: a channel (20) that has a predetermined width (W) and includes a bottom surface (22) and a top surface (24), in which a guide space (21) is formed to be opened in the bottom surface (22) so as to allow an external fastener to be moved in a longitudinal direction, and that is buried in the concrete so as to allow the guide space (21) to be exposed to the outside of the concrete; and an anchor (30) that is coupled to the top surface (24) of the channel (20) and is buried in the concrete when the concrete is poured, wherein the anchor (30) includes: a stem plate (40) in which a lower end (42) is coupled to the top surface (24) of the channel (20) through welding so as to have a length (L1) in a direction perpendicular to the top surface (24) of the channel (20); and an anchor head plate (50) that has a predetermined length (L2) and width (w2), and in which an upper end (44) of the stem plate (40) is coupled to a bottom surface (52) through welding so as to be perpendicular to a length (L1) direction of the stem plate (40).
 2. The plate welding-type anchor channel of claim 1, wherein the anchor head plate (50) and the stem plate (40) of the anchor (30) are made from plates, and have widths (w1 and w2) within the width (W) of the channel (20).
 3. The plate welding-type anchor channel of claim 1, a horizontal cross-sectional area (A2) of the anchor head plate (50) of the anchor (30) is 10 times greater than a horizontal cross-sectional area (A1) of the stem plate (40).
 4. A method for manufacturing a plate welding-type anchor channel that is buried when concrete is poured at the time of constructing a building to fix various external installations to a concrete structure later, the method comprising: preparing a channel (20) that has a predetermined width (W) and includes a bottom surface (22) and a top surface (24), in which a guide space (21) is formed to be opened in the bottom surface (22) so as to allow an external fastener to be moved in a longitudinal direction, and that is buried in the concrete so as to allow the guide space (21) to be exposed to the outside of the concrete, and an anchor (30) that is coupled to the top surface (24) of the channel (20) and is buried in the concrete when the concrete is poured; and integrally coupling the channel and the anchor, wherein the preparing the anchor (30) includes: preparing a first plate (40′) and a second plate (50′) that are made from plates having predetermined lengths (L1 and L2) and widths (w1 and w2); coupling an upper end (44) of the first plate (40′) to a bottom surface (54) of the second plate (50′) through welding to be perpendicular to a length (L1) direction of the first plate (40′); and coupling a lower end (42) of the first plate (40′) through welding to be perpendicular to the top surface (24) of the channel (20).
 5. The method for manufacturing a plate welding-type anchor channel of claim 4, wherein the preparing the anchor (30) includes forming a hole (45) in the first plate (40′).
 6. The plate welding-type anchor channel of claim 2, a horizontal cross-sectional area (A2) of the anchor head plate (50) of the anchor (30) is 10 times greater than a horizontal cross-sectional area (A1) of the stem plate (40). 